Machine for bending flanged metal bars



(No Model.)

I W. RAYMOND. I MACHINE FOR BBNDING FLANGED METAL BARS.

No. 530,203. Patented Decf l, 1894.

WITNESSES: X D9 6/ INVENTOH UNITED STATES PATENT QFFIECE.

WARD RAYMOND, OF JOHNSTOWN, PENNSYLVANIA.

MACHINE FOR BENDINGFLANGED METAL BARS.

SPECIFICATION forming part of Letters Patent No. 530,203, dated December 4, 1894.

Application filed March 23, 1894- To aZZ whom it may concern.-

Be it known that I, WARD RAYMOND, a citizen of the United States, residing at J ohnstown, county of Oambria, State of Pennsylvania, have invented a new and useful Improvement in Machines for Bending Flanged Metal Bars, of which the following specification is a true and exact description, due reference being had to the accompanying drawscribed. Fig. 2 is a side view thereof showing in dotted lines the position of the channel after being bent. Fig. 3 is a perspective View showing the manner in which portions of the flanges are folded together. Fig. 4 is a side view of a machine embodying my'invention. Fig. 5 is an end, and Fig. 6 atop, View thereof. Fig. 7 is a transverse section on line XX. Fig. 8 is a top view of a machine differently constructed from that shown in Fig. 4, as will be explained.

In general my invention consists in two abutting clamps pivoted together in which the channel may be securely held, one or both of the clamps being adapted to swing upon the pivot. The bending is effected by swinging the loose'clamp or clamps around, carrying the channel with it. I

In the drawings in which Figs. 4 to 7 illustrate a machine having only one clamp adapted to swing, A is any suitable base plate or foundation.

B and O are portions of two clamps pivotedtogether by the upper and lower pins D. B is bolted to the base plate by bolts b, but the clamp C is loose and adapted toswing upon the pivots D. These portions B and C have recesses formed in them adapted to receive the channel as shown. The clamps include chocks E fitting the inside of the channel. On these chocks are the tapering flanges F sliding in similarly tapering slots in the portions B and'O so that, as they are driven in, their wedging action clamps the channel firmly.

Serial No. 504,890. (No model.)

These clamp portions B and O and wedges are beveled off at the center so that the swinging one C, may turn the desired angle. The circular bosses G and H through which the pivot pins pass, the one below and the other above, overlap the flanges of the channel so that, as the channel lies in themachine before bending the outside of the flanges are backed by the former or clamped through the length of the machine.

In the chocks E are the pocketsK into which the flanges fold in a manner hereinafter described. The leverLaffords means for swing ing the pivoted chock O. WVhen the channel to be bent is small, this lever may be operated by hand, but it the beam be largerit may be necessary to substitute hydraulic or other power.

The operation of the machine is this: A straight channel being heated and placed in the machine the chocks E are driven in, clamping the channel tightly in the clamps. The pivoted one is now swung around bringing with it the portion of the channel clam pod therein. As all of the web is securely held between the portions B and G and chocks, except that portion M, Fig. 4., between the beveled ends of the chocks, all the bend must take place in this portion. Now let us see what happens to the flanges. As the portion 0 is pulled around the flanges being compressed begin to upset, but as they are thin the tendency is strong to buckle. Being supported by the clamps they cannot go outward so bend inward and fold into the pockets K in chocks E. As the beveled faces of the chocks come together, this fold is pressed into the shape of the cavities K and so shaped as desired. The slight compression or upsetting that takes place in the flanges before they commence to bend thickens them and renders the fold more rigid than it would be were the flanges simply folded without any previous upset.

In the drawings Ihave shown the pivot pin located on the out edge of the channel web. By this every part of the channel is compressed during the bending operation, for it is evident that every part of the section inside axis of bend is in compression, while everything outside willbe in tension and stretched. Thusby varying the location of the pivotI am enabled to locate the axis of bend through any desired point.

By beveling the chocks E, I am enabled to support the web up to the bending line and that portion of the flanges not supported by the chocks is intended to squeeze together so that I directly support every part of the channel which is to be kept from distortion and yet bend it with the desired bend.

As above mentioned, if the channel being bent is too large to be bent by the hand lever shown, any suitable means may be used for operating the movable portion or portions of the clamps, and, instead, of the exact style of chock shown, any suitable device may be used which will firmly hold the channel so as to prevent distortion except in the substantially triangular portions of the flanges shown between the beveled faces of the chocks.

In Fig. 8 the two clamps swing, the support S engaging the top pin D to steady them. By the yokes as shown, or in any other suitable manner, the clamps are connected with operating mechanism through rod 0.

I do not intend to limit myself to the use of chocks independent of the other portions of the clamps.

Having thus described my invention, what I claim, and desire to protect by Letters Patcut, is--- 1. A machine for bending flanged metal bars, comprising two abutting clamps pivoted together, both said clamps being adapted to receive a bar and so hold it as to prevent distortion therein, save at the bending point, the clamps being so constructed that when the bar is bent the flanges thereof are bent or folded together at the bending point as described.

2. In a machine for bending flanged metal bars in the manner described, in combination with a clamp adapted to receive and hold the bar; a clamp pivoted at the end of the first mentioned clamp and adapted to receive the bar, clamping members by which the bar is held in the clamps against distortion, the end of the clamps and clamping members being beveled for the purpose described; and operating mechanism.

3. In a machine for bending flanged metal bars in the manner described, in combination with a pair of clamps pivoted as described, said clamps havingrecesses to receive the bar; clamping members whereby the bar to be bent is firmly held in the clamps, said clamping members having their adjacent ends beveled and pockets in said ends so that, when the machine is operated to bend the bar, the faces of said beveled ends come together and a portion of a flange is folded into the pockets in said ends; and means for operating the machine.

4. In a machine for bending flanged metal bars in the manner described, in combination with a pair of clamps pivoted as described;

said clamps having recesses to receive the bar; clamping members whereby the bar to be bent is firmly held in the clamps, and pockets in the ends of said clamping members so that, when the machine is operated to bend the bar, a portion of a flange is folded into the pockets in said ends; and means for operating the machine.

5. A machine for bending channel bars in the manner described, comprising a pair of clamps pivoted together, said clamps having a recess in which the channel fits and which supports the outside of the channelthroughout the length of the clamps; chocks which fit the inside of the channel and secure it in the clamps, the adjacent ends of said chocks being beveled for the purpose set forth, and having in their beveled ends recesses into which the flanges of the channel fold, and which act to form the fold in the channel; and operating mechanism.

6. A machine for bending channel bars in the manner described, comprising a pair of clamps pivoted together, said clamps having a recess in which the channel fits and which supports the outside of the channel throughout the length of the clamps; chocks which fit the inside of the channel and secure it in the clamps, and having their adjacent ends provided with recesses into which the flanges of the channel fold and which act to form the fold in the channel; and operating mechan- 15111.

7. A machine for bending channel bars in the manner described, comprising a pair of clamps pivoted together, said clamps having a recess in which the channel fits and which supports the outside ot'the channel throughout the length of the clamps; chocks which fit the inside of the channel and secure it in the clamps, the adjacent ends of said chocks being beveled for the purpose set forth; and operating mechanism.

8. In a machine for bending flanged metal bars as described, a chock or filler fitting between the flanges of the bar and engaging the web at or near the bending line, said chock having the end adjacent to the bending line beveled as and for the purpose set forth.

9. In a machine for bending flanged metal bars as described, a chock or filler fitting between the flanges of the bar and engaging the web at or near the bending line, said chock having its end adjacent to the bending line beveled, and pockets in said beveled end adapted to receive the folded portions of the flanges when bent.

In testimony whereof I have affixed my signature in presence of two witnesses.

WARD RAYMOND. Witnesses:

WM. A. DONALDSON, HAMILTON E. FORD.

IIO 

